XML 72 R61.htm IDEA: XBRL DOCUMENT v3.22.2

Geographic and Other Information - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member] | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	73.00%	80.00%	72.00%	81.00%
Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer One [Member] | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	26.70%	40.00%	26.10%	44.60%
Customer Concentration Risk [Member] | Net Sales [Member] | Top Customer Two [Member] | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.30%	11.70%	13.10%	10.80%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			35.10%		31.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top Customer Two [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			18.90%		16.10%
Geographic Concentration Risk [Member] | Net Sales [Member] | Asia Pacific Other Than Korea [Member] | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	56.50%		64.00%
Geographic Concentration Risk [Member] | Net Sales [Member] | CHINA, HONG KONG | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		60.60%		58.60%
Geographic Concentration Risk [Member] | Net Sales [Member] | VIET NAM | Standard products business [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	26.70%	32.00%	20.40%	35.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=mx_TopTenCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mx_StandardProductsBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=mx_TopCustomerOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=mx_TopCustomerTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=mx_AsiaPacificOtherThanKoreaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=mx_ChinaAndHongKongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_VN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: